Bolt-anchor.



-H.' W. PLEISTER.

sou ANCHOR.

APFLlCATlON FILED APR. 15, I9I5.

Patented Oct. 5, 1915 msmm' WITNESSES H. W. PLEISTER.

BOLT ANCHOR.

APPLICATION FILED APR. I6. 1915.

1 1555 614.. Patented M1915;

2 SHEETS-SHEET 2.

I A drfiwi srrrrns rad enrich.

HENRY W. PLEISTER, OF WESTFIELD, NE'W JERSEY, LASSIGNOR TQ HENBY B. NEWHALL.

- BOLT-ANCHOR.

Original application filed January 20, 1915, Serial No. 3,328. Divided and thisapplication filed April 16,

. 1915. Serial No. 21,635.

To all whom it may concern:

Be it known that I, HENRY W. PLEIsrER, a citizenof the United States, and a resident of VVestfield, in the county of Union and'btate of New Jersey, have invented certain new and useful Improvements in Bolt- .Anchors, of which the following is a specification, taken in connection with the accompanying drawings, which form a part of the same.

This application is a division of my 'companion application Ser. No. 3,328 filed January 20, 1915.

My invention relates to.bolt anchors, and one in which both the shield and the bolt or screw contact directly with the walls of the support in which they are mounted. More particularly it relates to a one part SlllGltlWVlllCl'l may be manufactured and sold separately as an article of manufacture.

Previous to myinvention it has been the common practice to hzwe shields and anchors with two or more expanding members between which the bolt or screw was mounted, the diiferent members of the shield or anchor bein forced-apart as the bolt or screw was inserted between them. In such bolt anchors the threads of the screw or bolt engage simply with the different members of'the shield or anchor and do not engage directly with the walls of the orifice. In the old practice the shields are formed of at least twomembers, and the anchors are provided with at least twotin'es or forks, it being understood that in the trade an 9 anchor has an integral headfrom which extends two' or more tines. Ordinarily the trade use the term anchor when referring to ductile material in which the male screw threads of the expanding member will cut their own cooperating female screw threads in the softer material of the anchor.

By my invention I omit entirely one of the eXnansible members and save all the expense incident to itsmanufacture, handling and shipping. I

By my invention the screw threads of the I bolt or screw engage directly with the walls of the orifice as well as with my expansion shield.

In my invention the complete bolt anchor comprises a shield member and the expanding member whether that be a bolt or screw.

I form my shield of ductile material,

Specification of Letters Patent.

screw to cut their own cooperating threads in the shield.

I have shown in the accompanying drawings several illustrative embodiments of my invention, but of course it is to be'understood that my invention is not to be confined simply to the forms illustrated. In

these drawings the same reference numerals refer to similar parts.

Figure 1 is a longitudinal vertical section through a support and the work supported showing'one form of my bolt anchor formed of some comparatively soft ductile material which is softer than the material of which the bolt is formed so that the latter will cut its own screw threads; Fig. 2 is a perspective view of the ductile shield shown in 'Fig. 1; Fig. 3 is a'longitudinal vertical section of a modified form of ductile shield which is provided with a rib in which the bolt will cut its own cofiperating screw threads; Fig. 4 is a perspective view of the shield shown in Fig. .3; Fig. 5 is a longitudi- -nal vertical section through a support and the article supported showing a tapered substantially semi-cylindrical one part shield formed of some ductile material into which the threads of the bolt will cut' their own cooperating female threads. In this figure the hole in the support is at right angles to the face of the support and a beveled washer is shown to compensate for the inclination of the bolt head; Fig. 6 is a perspective view of the ductile shield illustrated in Fig. 5; .9 Fig. 7 is atransverse vertical section through a channel'beam and its support showing my ductile bolt anchor adapted to coiiperate directly with a flange of the channel beam so as to positively' h'old it to its support; Fig. 8 is a View similar-to Fig. 5 except'that in this figure the hole or aperture in the supportis at an angle tothe'face of the wall; F 9 is In all forms of my invention the bolt or screw, whichever 1s used, contacts directly with the surface of the hole in the support. and, in addition, in this particular invention, cuts its own cotiperating female screw threads in the comparatively soft material of the shield.

To'use my invention, a hole 3 is drilled in any support 1 of masonry, brick, terra cotta,

concrete, wood or any other suitable support,.for the insertion of the ductile shield 1, Figs. 1 and 2. In the form of my invention shown in these figures. the shield at is a semi-cylindrical member provided with an axial bore 5; its ends 6 and 7 are substantially of the same cross section. The lag bolt 2, for example, may be the screw threaded coiiperating member which is used as the expanding member so that its-male screw threads 8 will cut their own cotiperating screw threads in the comparatively soft material of the shield. The taper of the lag bolt, or wood screw, if one is used, serves 'to expand the ductile shield into a firm contact with a portion of the wall of thehole while the lag bolt, or other expanding member, directly bears upon other portions of the wall of the hole. In this man ner the work 9 is held firmly and securely to the face 10 of the support 1.

In some instances I may provide a shield 11, Figs. 3 and 1, with a longitudinally ex tending rib 12 in which the screw threads 8 of the lag bolt 2 will cut their own coiiperating screw threads, see Fig. 3. Preferably this longitudinally extending rib 12 is formed at the same time at the body of the shield 11. In practice I preferably, though not necessarily, form my ductile shield 13 with an inclined surface I l so that the end 15 of the shield 13 which. is last to' be inserted in the hole, and which lies adjacent to the face of the wall, will be of less area than the other end 16 of the ductile shield. I have shown the simplest form in Figs. 5, 6, 7 and 8, and shown also, further modifications, in Figs. 9'and 11. By arranging the ductile shield with one end thinner than the other, or of less area, the inclinedsurface 14 is formed and itis up this inclined surface that the wood. screw or lag bolt 2 is screwed ome to hold'the work to the support. In this screwing home of,thescrew or bolt its male threads bear upon the wall of the hole and also cuttheir own cooperating female screw threads in the ductile shield. In Fig. 8 I have shown the bolt anchor formed of the ductile shield 13, and

drilled at the proper angle it will exactly compensate for the inclination of the lag bolt 2 due to it following the inclined surface 1% of the ductile shield 13. In such a case the work 9 will be brought up flush to the face 18 of the support, and the head 19 of the bolt '2 willbear firmly against the work 9.

In case the longitudinal axis of the hole 20 is drilled in the support 1 at right angles to the face 18 I preferably though not necessarily, use a beveled washer 21 between the head 19,of the bolt 2 and the work 9, Fig. lVithout such a washer only a portion of the head 19 would engage with the work '9. This inclination of the head of the bolt, when the hole in the support is substantially at right angles to the face, can be put to many practical advantages.

I have shown for example in Fig. 7 a base or support 22 having a hole 23 drilled substantially at right angles to the face 21 of the support 22 which may be of concrete, stone, or any other material. In this figure I have shown a bolt anchor comprising the shield" 13 and the lag screw 2 mounted in the opening 23 so that the head 19 will be inclined with relation to the face Q-l of the support. IVhen the work to be supported or held has an inclined surface, web, flange, lug or other member, this inclination of the head of the bolt will exactly cooperate with such an inclined member of the work to be supported or held. In Fig; 7 I have shown self some inclined surface or member which will exactly cooperate with the head of the bolt when it is inclined with, relation to the face of the support, \Vhile I have shown for example a channel member 25 it is of course obvious that the work maybe an I- beam, T-rail, rail, structural member, electrical apparatus having an inclined lug or memberor any other structure having an inclined holding surface. In such a construction as illustrated, for example, in Fig. 7, the holding capacity of the boltv anchor will be increased for the stress exerted upon the head 19, of the bolt will be partly shear and partly tension. In this form of my ductile boltanchor the lag bolt 2. or other upon the inclined surface'14 and travel 'in a line parallel with the axis of the shield. at

1,1eae1a 33 it' will be held in that position by the curvature of the hole in' the support. In this form the male screw threads 8, 8 willcut their own female screw threads in the face 14: of the shield and willbear directly upon" the material of the support Whatever that may be. Of course if the material of the supportl be brick, cinder concrete, or Wood or any material softer than that ofthe bolt. more orless deep female screw threads will he formed in the support by the male threads 8,8. In this form my completebolt anchor comprises the lag or other bolt 2 and the ductile shield 13.. y

In the constructions I have previously described I have shown my invention in the simplest form. Preferably though not .nec-

essarily I form the shield member with anchors.

some means which will prevent the accidental disengagement of the shield and expanding member. This is an advantage in case it is desirable to ship. orstore the bolt The means which I preferably employ to'hold the bolt and shield together also furnishes a'support or hearing for the bolt while under the shearing strains.

In Figs. 9. 10 and 11, I have shown one preferred form of my ductile bolt anchor in which. one or more retaining means as lugs are used to hold the ductile shield and expanding member together; In Fig. 9 my ductile shield 126 is preferably provided with an interior tapered bore 27 in 'which. the male threads of the wood screw 28, or lag bolt as the case may be. cut their own female threads. In this form 1 preferably provide the shield 26 with some retaining means to hold the expanding member from accidental disengagement in handling. storing or shipping for example. The retaining means which I preferably employ are one or more integral lugs 29, 29 which are preferably cast at the same time that the shield 26 is cast. These lugs are preferably cast open as shown in dotted lines in Fig. 12 and then bent as shown in full lines in that figure. In Fig. 9 the ductile shield 1% is pro ided with four such lugs. One such lug 30. Fig. 10. however. may he used if desired being preferably cast as shown in dotted lines and then bent up as shown in full lines in this figure Preferably. though not necessarily. the

bolt anchor is inserted in the opening 31 55 of the support 1 with the lugs downward and the cross ribs 32 of the shield 126 adapted to bite into the upper portion 33 of the support l. I preferably so locate the bolt anchor in the opening so as to compensate for shearing strains due to sui'iporting the work 9. The lugs 29. 29 serrc as a bearing for the screw 28, so that any shearing strains due to supporting the work J will tend to force the male threads 34. 34 into closer contact with the female threads that they cut in the shield 126. That is the greater the shearing strain, firmer will be the contact or engagement between the male threads 01: the screw or bolt and the shield which will cause the transverse ribs 32, of the shield to bite all the more into the wall 33,-

of the support to make a firmer and stronger CXpflnSlOl'l- It Is of course to be understood that it the 'shield 12Gis put into a hole drilled at right angles to the face of the wall that a bevel washer may be used the same as in the other figures. angle to the face 35 of the support 1 in which case it is not necessary to use such a bevel washer.

. It is of course to be understood that all forms-of my invention the bolt anchor may To economize in the amount of metal used m the ductlle shield I may. in some cases, l 1g. 11. form ashleld 36 having the inclinedsurface 37 to cotiperate with the la gor other bolt or screw and I provide transverse ribs 38 of varying height, those at the inner end,.which will be the end farthest in the hole, being of greater height than those nearer the other end of the shield. This construction simply saves metal by making the grooves 39. 39 between the different transverse ribs 38. 3S of greater depth, at the inner end. than in the other forms.

In addition to the marked economy in manufacture and ease of application of my bolt anchor and its advantage in directly cooperating with an inclined engaging sur face on the work to be supported or held. it also prolongs the life of the support, it that support happens to be wood. In light work. for example. in securing storm sash and awnings. a regular wood screw is often replaced in the same hole. the threads of screw on practically every new insertion cutting new threads in the wood which dis integrates the fiber of the wood and destroys its holding capacity. In such light work by my invention, only a portion of the surface of the hole would be engaged on each insertion of the screw. so that the life of the fiber of the wood would be prolonged. Not only thisIbut the wedging action of my bolt anchor wohld ompress orcondense any partly comminu'tell fiber 'of the wood-in the hole which would give the expansion bolt a strong hold even though the screw be repeatedly reinserted in the same hole.

Having thus described my invention in connection. with the illustrative embodi ments thereof to the details of which I do not desire to be limited except as required by the scope of the appended claims, what is claimed as new and what it is desired to Invthis Fig. 9 the hole is at an' lid secure by Letters Patent is set forth in the appended claims.

What I claim as my invention and desire to secure by'Letters Patent is 1. .An article of manufacture comprising a shield member having an open side, said member beingformed of ductile material to permit a bolt to cut its cooperating female threads in the open side of the shield and at the same time engage directly with the Wall of the support.

2. An article of manufacture comprising a shield member having an inclined surface and an open side, said member being formed of ductile material to permita bolt to cut its coiiperating female threads in the open side of the shield and at the same time engage directly with the wall of the support.

3. An article of manufacture comprising a shield member having an open side, said member being formed of ductile material to permit a bolt to cut its cooperating femalethreads in the open side of the shield, and at the same time engage directly with the Wall of the support and means to normally hold the shield and bolt together.

4:. An article of manufacture comprising a shield member having an inclined sin-face and an open side, said member being formed of ductile material to permit a bolt to cut its cooperating female threads in the open side of the shield, and at the same time engage directly with the wall of the support and means to normally hold the shield and bolt together.

5.'A bolt anchor comprising in combination an expanding member and 'a one partductile shield adapted to partly surround the expanding member.

6. A bolt anchor comprising in combination an expanding member and a one part ductile shield having a bore said shield adapted to partly surround the expanding member.

7. A bolt anchor comprising in combination an expanding member and a one part ductile shield having an inclined surface said shield adapted to partly surround the expanding member.

8. A bolt anchor comprising in combination an expanding member, and a one part ductile shield substantially SGIIIl-CVllIldllCill in cross sedtion at one end.

9. A bolt anchor comprising in combination an expanding member, and a one part ductile shield, substantially semi-cylindrical in cross section at one end, the other end being of less area in cross section.

10. A bolt anchor comprising in combination an expanding member, and a one part ductile shield, substantially semi-cylindrical in cross section at one end, the other end being ofless area in cross section and said ductile shield being provided with a bore.

11. A bolt anchor comprising in combination an expanding member and a one part ductile shield, substantially semi-cylindrical in cross section at one end, the other end being of less area in cross section and said ductile shield being provided with an inclined bore.

.12. A bolt anchor comprising in combination an'expanding member and a onepart ductile shield adapted to partly surround I the expansible member and means to secure the expansible member and shield together.

13. A bolt anchor comprising in combination an expanding member and a one part ductile shield adapted to partly surround the expansible member and means integral with the shield to secure the 'expansible member and shield together.

H. A bolt anchor comprising in combination an expanding member and a one part ductile shield adapted to partly surround the expanding member and one or more lugs on the shield adapted to hold the shield and expansible member together.

.15. A bolt anchor comprising in combinanation a screw threaded expanding member, and a ductile shield, the screw threads of the expanding member adaptedto engage at the same time the ductile shield and the wall of the aperture in which the bolt anchor is mounted.

HENRY W. PLEISTER.

Witnesses A. M. WILLnurs, M. R. RYAN. 

